LicenseChecker.java

package es.yohan.examples;

class LicenseChecker {
 
  int rootResult;
 
  void checkRoot(String xml_config) {
    //do some checking
    rootResult = 0;
    //setup other things
  }
 
  private boolean isValidLicense(String serialnumber)  {
      result = false;
      //computations here
      return result;
  }
  
  public void validateLicense() throws LicenseException {
      String serialnumber = Config.get("SERIAL");
      if (!isValidLicense(serialnumber)) {
          throw new LicenseException("Invalid serial number");
      }
  }
  
}